申请人:PFIZER INC.
公开号:EP0676236A1
公开(公告)日:1995-10-11
This invention relates to a process for the removal of an allyl or allyloxycarbonyl group from an allyl or allyloxycarbonyl group protected compound (such as an allylic ester, carbonate, carbamate, O-allyl derivatives or N-allyl derivatives), which comprises contacting the allyl or allyloxycarbonyl group protected compound with a sulfinic acid compound, in the presence of a palladium catalyst in a reaction-inert solvent.
Preferably, the sulfinic acid compound is represented by the formula:
X-SO₂M (I)
wherein X is C₁₋₂₀ alkyl, substituted C₁₋₂₀ alkyl (wherein the substituent(s) are independently halo, nitro, sulfo, oxo, amino, cyano, carboxy, hydroxy or moieties derived therefrom), phenyl, substituted phenyl (wherein the substituent(s) are independently C₁₋₃ alkyl, halo nitro, sulfo, oxo, amino, cyano, carboxy, hydroxy, acetamido or moieties derived therefrom), furyl or thienyl; and M is hydrogen, an alkali metal or ammonium salt residue.
Of these, most preferred sulfinic acid compound is lithium p-toluenesulfinate, sodium p-toluenesulfinate, potassium p-toluenesulfinate, p-toluenesulfinic acid, ammonium p-toluenesulfinate, lithium benzenesulfinate, sodium benzenesulfinate, potassium benzenesulfinate, benzenesulfinic acid or ammonium benzenesulfinate.
This invention is well suited to a process for the conversion of an allyl ester of 5R,6S-6-(1R-hydroxyethyl)-2-(1R-oxo-3S-thiolanylthio)-2-penem-3-carboxylic acid to 5R,6S-6-(1R-hydroxyethyl)-2-(1R-oxo-3S-thiolanylthio)-2-penem-3-carboxylic acid.
本发明涉及一种从烯丙基或烯丙氧羰基保护的化合物(如烯丙基酯、碳酸酯、氨基甲酸酯、O-烯丙基衍生物或N-烯丙基衍生物)中去除烯丙基或烯丙氧羰基基团的方法,该方法包括在反应惰性溶剂中,在钯催化剂的存在下,将烯丙基或烯丙氧羰基保护的化合物与亚磺酸化合物接触。优选地,亚磺酸化合物具有以下通式:X-SO₂M (I),其中X为C₁₋₂₀烷基、取代的C₁₋₂₀烷基(其中取代基独立地为卤素、硝基、磺基、氧代、氨基、氰基、羧基、羟基或由此衍生的基团)、苯基、取代的苯基(其中取代基独立地为C₁₋₃烷基、卤素、硝基、磺基、氧代、氨基、氰基、羧基、羟基、乙酰氨基或由此衍生的基团)、呋喃基或噻吩基;M为氢、碱金属或铵盐残基。其中,最优选的亚磺酸化合物为锂对甲苯亚磺酸、钠对甲苯亚磺酸、钾对甲苯亚磺酸、对甲苯亚磺酸、铵对甲苯亚磺酸、锂苯亚磺酸、钠苯亚磺酸、钾苯亚磺酸、苯亚磺酸或铵苯亚磺酸。本发明特别适用于将5R,6S-6-(1R-羟乙基)-2-(1R-氧代-3S-硫杂环己硫基)-2-青霉烯-3-羧酸的烯丙基酯转化为5R,6S-6-(1R-羟乙基)-2-(1R-氧代-3S-硫杂环己硫基)-2-青霉烯-3-羧酸的过程。